THEORY

In the example above, the theory returned is the one in force when ACL2 is
started up (see ground-zero).

General Form:
(theory name)

where name is the name of a previously executed deftheory event.
Returns the named theory. See theories.

This ``function'' is actually a macro that expands to a term
mentioning the single free variable world. When theory expressions
are evaluated by in-theory or the :in-theory hint, world is bound to
the current ACL2 world.